package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车相关功能
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前购物车商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //存在，只需要将数量加一
        if(list != null && list.size()>0){
            ShoppingCart shoppingCart1 = list.get(0);
            shoppingCart1.setNumber(shoppingCart1.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart1);
        }else{
            //不存在，需要插入一条购物车数据
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId !=null){
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 展示购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        //获取当前的用户的id
        Long currentId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart=ShoppingCart.builder()
                    .userId(currentId)
                    .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     * @return
     */
    public void cleanShoppingCart() {
        Long currentId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(currentId);

    }

}
